Copyrighted Music on Local Businesses Website

So I visited the website of a local pizza place in my area today and on each site they have there is an embedded mp3. I’m positive that this would be frowned upon if the correct people were to see it and as much as I don’t want to ruin their fun I’d like to let them know that this may be an issue for them.

Sending them an email is not a problem but I was wondering if anyone knew of any quick links I could send them as proof that this could be a potential problem for them. Thanks in advance!

Perhaps they have gotten permission to use it from the copyright holder? If I were inclined, I would probably just send the owner an email asking if that was the case, and if not, mention that you’d hate to see them be sued and have to go out of business because they weren’t aware of copyright law.